Gamma analysis in volumetric dose verification in intensity modulated radiation therapy

IMRT treatments are planned and finalised with predetermined volumetric dose distribution to planning target volume (PTV) and organ at risk (OAR). However dose verification using planer detector and point dose does not suffice to verify the volumetric set dose criteria during the planning of IMRT. 3D dosimetry systems allow volumetric comparisons of planned and delivered dose using the dose volume histogram for organ of interest. In this way we can compare the planned and delivered dose as per the ICRU 83. To be more practical 3D gamma analysis methods make it possible to analyze planned and delivered dose verification by taking into account for small setup errors of the dosimeter phantom and/or detector. This work describes the results of volumetric dose verification using dose at 98%, 95%, 2% to volume of interest and 3D gamma analysis methods in IMRT using computational environment for radiotherapy research software platform by incorporating quantitative 3D gamma analysis tools